How to disable multiple keymaps with the same name?
Call pie menu operator
Firstly the name is the id (bl_idname) of the call pie menu operator.  The idname of the registered pie menu is passed as name property to the operator.
To call snap pie menu
bpy.ops.wm.call_menu_pie(name=&quot;VIEW3D_MT_snap_pie&quot;)

Distinguish by the operator's name property

To distinguish between them look at properties passed to the operator.
Test script to make a list of all pie menu short cuts in 3D view (from question).  Look for all the keymap items using this operator &quot;wm.call_pie_menu&quot; and populate  list with the name of the menu.
import bpy

context = bpy.context

wm = context.window_manager
active = wm.keyconfigs.active
view3d = active.keymaps[&quot;3D View&quot;]

# using call menu

pies = [km.properties['name'] for name, km in view3d.keymap_items.items() if name == &quot;wm.call_menu_pie&quot;]

print(pies)

output
['VIEW3D_MT_view_pie', 'VIEW3D_MT_snap_pie', 'VIEW3D_MT_pivot_pie', 'VIEW3D_MT_orientations_pie', 'VIEW3D_MT_shading_pie']

List Comprehension
The list pies is created with list comprehension.  Recommend getting head around list comprehension.
To disable all, Note pies is different here, it is being populated with the keymapitems, not the value of the operator name property

pies = [km for name, km in view3d.keymap_items.items() if name == &quot;wm.call_menu_pie&quot;]

for pie in pies:
    pie.active = False

To disable all but snap

for pie in pies:
    pie.active = pie.properties['name'].endswith(&quot;snap_pie&quot;)

Toggle

for pie in pies:
    pie.active = not pie.active

All call pie menu keymap items in all active keymaps
Create a dictionary of all all the call pie menu operates in each keymap.
all_pies = {
        km.name : [
            kmi for name, kmi in km.keymap_items.items() 
            if name == &quot;wm.call_menu_pie&quot;
            #and kmi.properties['name'].endswith(&quot;foo&quot;
        ] 
        for km in active.keymaps
        }

for name, pies in all_pies.items():
    if pies:
        print(name, [pie.properties['name'] for pie in pies])

Result
Grease Pencil Stroke Edit Mode ['GPENCIL_MT_snap_pie', 'VIEW3D_MT_proportional_editing_falloff_pie']
Weight Paint ['VIEW3D_MT_wpaint_vgroup_lock_pie']
Object Mode ['VIEW3D_MT_proportional_editing_falloff_pie']
Curve ['VIEW3D_MT_proportional_editing_falloff_pie']
Sculpt ['VIEW3D_MT_sculpt_mask_edit_pie', 'VIEW3D_MT_sculpt_face_sets_edit_pie']
Mesh ['VIEW3D_MT_proportional_editing_falloff_pie']
Metaball ['VIEW3D_MT_proportional_editing_falloff_pie']
Lattice ['VIEW3D_MT_proportional_editing_falloff_pie']
Particle ['VIEW3D_MT_proportional_editing_falloff_pie']
3D View ['VIEW3D_MT_view_pie', 'VIEW3D_MT_snap_pie', 'VIEW3D_MT_pivot_pie', 'VIEW3D_MT_orientations_pie', 'VIEW3D_MT_shading_pie']
UV Editor ['IMAGE_MT_uvs_snap_pie', 'VIEW3D_MT_proportional_editing_falloff_pie']
Mask Editing ['VIEW3D_MT_proportional_editing_falloff_pie']
Graph Editor ['GRAPH_MT_snap_pie', 'VIEW3D_MT_proportional_editing_falloff_pie', 'GRAPH_MT_pivot_pie']
Image ['IMAGE_MT_pivot_pie']
NLA Editor ['NLA_MT_snap_pie']
Clip ['CLIP_MT_tracking_pie', 'CLIP_MT_solving_pie', 'CLIP_MT_marker_pie', 'CLIP_MT_reconstruction_pie']
Clip Editor ['CLIP_MT_pivot_pie']